As of June 18, 2026, IDEAYA Biosciences's top three insider holders are Yujiro S Hata (President And Ceo, 690.70K shares), Michael P. Dillon (Svp, Chief Scientific Officer, 78.79K shares), Jason Throne (Chief Legal Officer, 63.48K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Jeffrey Stein | - | 54,281 | 0 | 02 Mar, 2026 |
| Yujiro S Hata | President And Ceo | 690,695 | 0 | 19 Feb, 2025 |
| Douglas B. Snyder | Svp, General Counsel | 2,080 | 0 | 02 Feb, 2026 |
| Michael P. Dillon | Svp, Chief Scientific Officer | 78,789 | 0 | 06 Oct, 2021 |
| Paul A. Stone | Chief Financial Officer | 9,303 | 0 | 31 Aug, 2023 |
| Jason Throne | Chief Legal Officer | 63,484 | 0 | 27 Jun, 2024 |
| Briseno Andres Ruiz | - | 26,466 | 0 | 02 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Mar, 2026 | Jeffrey Stein | Common Stock | A | 50,000 | $32.96 | 54,281 | D | P |
| 30 Jan, 2026 | Michael Anthony White | Stock Option (right to buy) | A | 190,000 | $0.00 | 190,000 | D | A |
| 30 May, 2025 | Douglas B. Snyder | Common Stock | A | 1,039 | $16.91 | 1,039 | D | A |
| 29 Nov, 2024 | Briseno Andres Ruiz | Common Stock | A | 682 | $23.26 | 25,213 | D | A |
| 30 Jan, 2026 | Yujiro S Hata | Stock Option (right to buy) | A | 600,000 | $0.00 | 600,000 | D | A |
| 30 Jan, 2026 | Darrin Beaupre | Stock Option (right to buy) | A | 175,000 | $0.00 | 175,000 | D | A |
| 30 May, 2025 | Douglas B. Snyder | Common Stock | A | 1,039 | $16.91 | 1,039 | D | A |
| 30 Jan, 2026 | Michael Anthony White | Stock Option (right to buy) | A | 190,000 | $0.00 | 190,000 | D | A |
| 30 Jan, 2026 | Stuart Dorman | Stock Option (right to buy) | A | 155,000 | $0.00 | 155,000 | D | A |
| 29 Nov, 2024 | Briseno Andres Ruiz | Common Stock | A | 682 | $23.26 | 25,213 | D | A |
| 30 Jan, 2026 | Joshua Bleharski | Stock Option (right to buy) | A | 170,000 | $0.00 | 170,000 | D | A |
| 28 Nov, 2025 | Briseno Andres Ruiz | Common Stock | A | 1,253 | $16.91 | 26,466 | D | A |
| 28 Nov, 2025 | Douglas B. Snyder | Common Stock | A | 1,041 | $16.91 | 2,080 | D | A |
| 28 Nov, 2025 | Douglas B. Snyder | Common Stock | A | 1,041 | $16.91 | 2,080 | D | A |
| 28 Nov, 2025 | Briseno Andres Ruiz | Common Stock | A | 1,253 | $16.91 | 26,466 | D | A |
| 30 Jan, 2026 | Briseno Andres Ruiz | Stock Option (right to buy) | A | 80,000 | $0.00 | 80,000 | D | A |
| 30 Jan, 2026 | Douglas B. Snyder | Stock Option (right to buy) | A | 130,000 | $0.00 | 130,000 | D | A |
| 30 Jan, 2026 | Briseno Andres Ruiz | Stock Option (right to buy) | A | 80,000 | $0.00 | 80,000 | D | A |
| 30 Jan, 2026 | Douglas B. Snyder | Stock Option (right to buy) | A | 130,000 | $0.00 | 130,000 | D | A |
| 24 Jun, 2025 | Malcolm Garret Hampton | Stock Option (right to buy) | A | 20,000 | $0.00 | 20,000 | D | A |